package com.sky.service.impl;

import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.domain.Dish;
import com.sky.domain.DishFlavor;
import com.sky.domain.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import com.github.pagehelper.Page;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表插入1条数据
        dishMapper.insert(dish);
        //获取insert语句生成的主键值ID
        Long dishId = dish.getId();
        //获取口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        //判断是否需要插入口味数据
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                //设置该口味对应的菜品id
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //使用分页工具提取分页参数
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        //下一条sql进行分页，自动加入limit关键字分页
        Page<DishVO> page = dishMapper.page(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 根据id删除菜品
     * @param ids
     */
    @Override
    public void deleteByIds(List<Long> ids) {
        //查询菜品状态，判断是否可以删除
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //起售中的菜品不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //查询当前菜品是否关联了套餐,如果关联了就抛出业务异常
        List<Long> setmealIds = setmealMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0){
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //进行到这里,说明可以删除
        for (Long id : ids) {
            //删除菜品数据
            dishMapper.deleteById(id);
            //删除菜品口味数据
            dishFlavorMapper.deleteByDishId(id);
        }
    }

    /**
     * 根据id查询菜品及关联的口味
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据id查询菜品口味
        List<DishFlavor> flavors =dishFlavorMapper.getByDishId(id);
        //存入dishVO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    /**
     * 修改菜品及关联的口味
     * @param dishDTO
     */
    @Override
    public void updateDishWithFlavor(DishDTO dishDTO) {
        //取出DTO中的菜品数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //更新菜品数据
        dishMapper.update(dish);
        //根据dishId删除口味数据
        dishFlavorMapper.deleteByDishId(dish.getId());
        //取出DTO中的口味数据,重新插入口味数据库
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //遍历设置每个口味对应的菜品dishId
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(dish.getId());
            }
            //将口味数据插入口味数据库
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品(管理端)
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> listByCategoryId(Long categoryId) {
        //查询菜品数据
        List<Dish> dishList = dishMapper.listByCategoryId(categoryId);
        return dishList;
    }

    /**
     * 根据id修改菜品起售停售状态
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        //更新该id的菜品的状态
        dishMapper.update(dish);
        //如果是把状态改为0停售,还需要同时将包含当前菜品的套餐也停售
        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(id);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类category_id查询已起售的菜品(用户端)
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}